I have a field called 'SNAP_DATE' which needs to be represented in the form of 'week- Year'

Eg : This week will be 2418 or 242018.

Is it possible to get this in Tableau ?

I tried to do this in a crude way:

First got Week = week(SNAP_DT) and Year = year(SNAP_DT) as separate columns and tried to concatenate these in a 3rd column after making both the first teo columns as discrete, Week-Year = [Week]+[Year] but this doesnt work as Tebleau just adds the two numbers.